Wear distribution device for friction wheels



1950 F. J. TIPPEN WEAR DISTRIBUTION DEVICE FOR FRICTION WHEELS Original Filed April 30, 1945 I illllltll liiilllli! A By M H S ATTORNEY Patented Oct. 24, 1950 UNITED STATES P TENT -EOFFICE :WEAR- DISTRI-BUTION-DEVICIE FOR FRICTION WHEELS Frank John Tippen, Coventry" England Original applicationApril 30," 19.45; Serial N6, 59 1;083. aDividedsand this applicationeMarch a 11,1947,.SerialNm $733,748 In Great-Britain -May 5, 1944 Section-- lgPublic Law 690, Aug'u5tigfl5946 Patent-expires May. 5, 1964 With such an arrangement theizworking-.sur-" face of the transmittingrfrictionr disc is .ltheoretically a line extending around "its periphery, :and an objectgof'th'e presentirlventionds to provide a construction-wherein the points of :contact aredispersed across an'appreciablerwidth of the periphery of the transmitting friction disc, in-

stead of lying-always onthe'sam'e circumferen tial line.

A further object of the-invention is torconstruct the transmitting friction disc sothat any wear that takes place on its periphery instead of forming a fiat thereon will maintain a partspherical characteristic ofthe surface.

j-Other objects of my invention will become apparent'from the followingdescription. Referring'to 'the'dra'wings:

Figure 1 is a sectional plan view showing one construction of gear in accordance "with the present'invention;

Figure-z isa sectional 'viewshowing thevpre-s ferred construction of friction-transmitting disc; Figure 3 is a sectional view inside elevation of the driving disc;and

Figure his an end view of thedriving disc.

In the construction shown the driving disc is shown at 10 and the driven disc at I I. The disc IOis mounted upon ashaft l2,- and the disc 'II is mounted on a shaft l3, the shafts I2 and I3 being parallel to'each other but being'out of line. The'discs l0 and llarecoupled together frictionally by a friction-transmitting disc l4 mounted on a shaft 15 whichis'parallel tothe faces 'of'the discs 10 and H.

The transmitting disc I 4 is constructed as shown in Figure 2, wherein thefbody 32 is provided with a peripheral flange 33, opposite sides 34 and 35 of which are-obliquely disposed in relation to a plane which at-rightangles to the axis of the body 32. I

Rings 36 and 3'l are detachably secured against the shoulders and 35, the opposed surfaces of these rings being in line with the shoulders 34 and 35, andbetween therings ismountedrairenewabletire 38 ,=-this vtire bearing onaatcylindrlcal V acclai (01. 14-194) surface 39;.onethenibody, the :axis ofwhich his in clined to the axis of the body. I

' The-"body is mounted on a ballubearing '40 mounted on afianged collar 4| fixed to the shaft l5 so that endwise; movement of the shaft 1-5 is transmitted to-the disc l4. The tire 38 can creep circumferentially, onthe .body as the disc rotates; With 2 the resultnthat ethe points of contact between the tire-and thettwo discs l0 and Elbe-- come spread :over. an appreciable "width of the part-spherical engaging surface. 42., thus distributing wear over a :considerable parea instead of it being confined to ;a circumferentialiline. Further, with this arrangement thesperiphery of the tire 38'willtnotztendto wear flat'. .Thet'partspherical shape ofi-lthe surface 42 will continue to be retaine'dxevenif'wear takesplace.

The periphery ofrthexflange 33 forms an-exterior bearing :the vaxisoii which intersects :the' axis of therabearin 40 andis inclinedthereto at a small angle? il'hetire 38-has its :periphery shaped as a :portion ofa sphere theradius of which isqual to'the'radius of the periphery.

Each ofthe rings'36, 37 is provided witha slot 43 which is passed over the projecting end ofa pin 44 which is a 'slidingfit in the bodyd32 so that each of these rings 'isprevente'd from 'rotation relatively to the'bodv." Further, each end'of-the body is providedwith a-screwthread ii-upon which "is screweda -lock-nut '46 to keep the rings 36 and 31 in'position.

Either the disc I!) or -'l'l,orlboth,-may be constructed as shown-im-Figures 3' and 4, wherein the face of the disc 1 0 isprovided with a circular recess l'4ll=which is eccentric-in relation tothe periphery of thedisc and mounted in this eccentric recess is a'i'aceplatel ll This-faceplate is mounted on a=boss t lz which is concentric with the recess I40 but eccentric in relation to the periphery" of the idisc.

The face plate I4] is retained against theibottom of the recess by a screw and washer, as

shown.

,With. thisarrangement the face plate, I 41 is able to creep around .theicentre of the boss 11.42

during the Working .of1the ?gear, with "theresul't that the points of: contact between the frictiontransmitting-disc I 4 and. the plates. Ml'wi llhot all he uponfla :circular line but will become, dispersed toverantappreciable area of the plate I4 I a Furthenothe disc II) is ofhollow construction atthe back and -,is provided-with a somewhat resilient plate by which the disc issecured by a flange 5! on the driving shaft l2.

2,527,2os I to a plane at right angles to the axis of the body,

rings on the body one on either side of the flange said rings engaging opposite sides of the flange,

and engaged at diametrically opposite positions by the driving and driven members, and means for moving the disc axiallythe power transmission=disccomprising a body having a peripheral flange, opposite sides of which are disposed in parallel planes which are inclined to a plane at right angles to the axis of the body, rings on the said rings being secured on the body against rotation relatively thereto and havin their opposed surfaces disposed one in line with'each side of said flange, the opposed sides of-said rings projecting beyond the peripheryof said flange, said flange having a periphery the/axis of which is inclined to the axis of the body, a renewable tire rotatably mounted between theopposed sides of the rings and on the periphery of the flange, the ,7:

periphery of said tire bein of part-spherical form with its centre at the centre of the tire, means for retaining said rings against axial movement, and means for supporting 'thebodyrotatably on ashaft. a

2. A power-transmission disc for variable speed gear of the kind specified comprising a hollow body, a bearing'in the body for engaging a support, said body having an exterior bearing surface the axis of which intersectsthe-axis ofthe bearing in the body andis -inclined thereto at a small angle, a tire mounted on said-exterior bearing surface and capable-of. rotating. relatively to the body, said tire havinga periphery of part-spherical form the radius of whichlis equal to the radius of said periphery, and means for preventing said tire from moving axially..-. V

3. A power-transmission disc forvariable speed gear of the kind specifiedwcomprising a hollow body, a bearingin the body for engaging a support, said body having anexterior flange the periphery of which forms an'exterior bearing surface the axis of which is inclined at a small angle to the axis of the bearing in the body, opposite sides of said exterior flange being disposed in parallel planes which are, atright anglesto the axis of said exterior bearing surface, rings on the body one on either side of the flange, said rings being secured on thebody against rotation relatively thereto and having their opposed surfacesdisposed one in line with ,each side of said flange, the opposed sides of said rings projecting beyond the periphery of ,said; flange, a tire mounted on said exterior bearing surface and capable of rotating-relatively to. the body, said tire having a periphery -of part-spherical-form the radius of which is equal to the radius of said periphery, and means for locking said rings against axial movement.-

4. In a variable speed gear having rotary driving and driven members providing spaced parallel surfaces, a shaft disposedbetween and parallel to said surfaces, a power transmission friction disc rotatable around the ,axispf said shaft and engaged at diametrically opposite positions by the driving and driven members,and means for moving said discaxially, the power transmission friction disc having a tire formed as a circular ring having a part-spherical peripher and mounted on the body 'of 'the 'disc so that it can rotate relatively theretojthe tire being mounted to rotate about an'axis which is inclined at a small angle to the axis'of rotation ofthe'disc.

5, In a variable speed 'gearhaving-iro tary driving and driven members providing spaced parallel surfaces, a shaft disposed between and parallel to said surfacesfa power transmission friction disc rotatable about die-"an er the 'said shaft body one'on either side of the flange, said rings engaging opposite sides of the flange, said rings being secured on the body against rotation relatively thereto and having their opposed surfaces disposed one in linewith each side of said flange, the opposed sides of said rings projecting beyond the periphery of said flange, said flange having a periphery the axis of which is inclined to the axis of the body, a renewable tire rotatably mounted between the opposed sides of the rings and on the periphery of the flange, the periphery of said tire being of part-spherical form with its centre at the centre of the tire, means for retaining said rings against axial movement, and means for'supporting'thebodyrotatably on ashaft.

6. In a variable speed gear having rotary driving and driven members providing spaced parallel surfaces, a shaft'disposedbetween and parallel to'said surfaces, a power transmission friction disc rotatable around ,thelaxis 0f,v saidshaft and engaged at diametrically opposite positions by the driving and driven members, and means for mov ing the disc axially, the:power transmission disc comprising a hollow body, apbearing in the body for engaging'a support,.said body. having an exterior bearing surfaceztheaxis of ,which' intersects the axis of the :bearing in the body and is inclined thereto at asmall angle, .a tiremounted on'said exterior bearing-surface and capable of rotating relatively to the body, said tire having a periphery of part-spherical form the radius of which is equal to the radius of said periphery,

' and means for'preventing said tire from'moving 7. In a variable speed gear having rotary driv ing and driven members providing spaced parallel surfaces, a shaft disposed between and parallel to said surfaces, a powertransmission friction disc rotatable around the axis, of the said shaft and engaged at 'diametricallyppposite positions by the driving and driven members, and means for moving said disc axially, the power transmission disc comprising a hollow bodyg-a bearing in the body for engaging a; support, said body having an exterior flange the periphery of which forms an exterior bearingsurface the axis of which is inclined at a small angle to the axis of the bearing in the body, opposite sides of said exterior flange being disposed inparallel planes which are at right angles to the axis of said exterior bearingsurface, rings'oni the body one on either side of the flange, said rings being secured onfthe body against rotation relatively'thereto and having their opposed surfaces disposed one in-line'with eachsideof said-flange, theopposed sides of said rings projecting beyond the periphery of said flange, a tire mounted on said exterior bearing surface and capable 'of rotating relatively to the body; said tire having a pe-' riphery of part-spherical form the radius of which is equal to the radius of said periphery, and means for locking said r'ings against axial movement.

8. In a variable speed gear having 'a driving disc and a drive'nfdisc arranged with opposed parallel face portions, a 'transmitting disc sup ported for rotation onaii axis'transverse to the axesof said driving and driven discs, said transmitting disc including an idle body portion having a circumferentially-extending recess in its edge with the plane of said recess inclined at a small angle out of perpendicularity with the axis of said transmitting disc and a driving torque transmitting tire supported in said recess having a periphery of part-spherical form, the periphery having its centre of curvature disposed at the centre of the tire, for frictional engagement with said opposed face portions and having the remaining portions engaging frictionally and slidably with the walls of said recess whereby automatic creeping of the tire relatively to the body occurs in the normal operation of the gear substantially independently of the driving torque transmitted whilst maintaining constant engagement of the gear.

9. In a variable speed gear, rotary driving and. driven members providing spaced parallel surfaces, means drivingly coupling said surfaces, said means comprising a friction disc supported between said surfaces for movement parallel to said surfaces, said disc being provided with a resilient tire formed as a circular ring and mounted on the body of the disc, said tire en- Number gaging said surfaces, the disc being provided with means rotatably supporting the tire for rotation about an axis which is inclined at a small angle to the axis of the disc, and the rotary driving .member comprising a disc formed with a cirrecess, and means for retaining said plate in said recess.

FRANK JOHN TIPPEN.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PA'IENTS Name Date 1,175,893 Schoenky Mar. 14, 1916 1,245,865 Bugbee Nov. 6, 1917 1,665,902 Bastian Apr. 10, 1928 FOREIGN PATENTS Number Country Date 386,095 France Apr. 4, 1908 883,564 France July 8, 1943 

